A client's serum chemistry values are serum sodium level 142 mEq/L, blood urea nitrogen (BUN) 15 mg/dl, and glucose level 90 mg/dl. What is the client's body fluid osmolality?
a. Iso-osmolar
b. Hypo-osmolar
c. Hyperosmolar
d. Hypotonic
ANS: A
To calculate osmolality, use the equation:
2(serum Na concentration) + BUN/3 + glucose level/18.
2(142) + 15/3 + 90/18 = 294 mOsm/kg, or iso-osmolality.
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